Liberte Environmental Associates

NPDES Permits Potentially Affecting Water Quality


Final NPDES Wastewater Permits - Issued by Oregon Department of Environmental Quality

This list consists of permit documents* (see end) made available by Oregon DEQ and is not all inclusive. All documents are PDF except where indicated.

Toyo Tanso Troutdale Industrial Waste (IW) Discharge: Final NPDES Wastewater Permit Related Documents

Toyo Tanso Troutdale IW - Semi-conductor Graphite Parts Production Non-contact Cooling Water & Other Final Permit*

Toyo Tanso Troutdale IW - Semi-conductor Graphite Parts Production Non-contact Cooling Water & Other Final Fact Sheet*

Permitted Mixing Zone Size for Toxicity:

Acute Mixing Zone Radius: Not given.

Acute Mixing Zone Surface Area: Not given.

Chronic Mixing Zone Radius: Not given.

Chronic Mixing Zone Surface Area: Not given.

Chronic Mixing Zone Volume: No more than 25% of Arata Creek low flow (7Q10).

*LEA Disclaimer for compiled, unlocked and OCR documents: From time to time LEA will post on this website scanned documents, and additional documents otherwise limited in accessibility. Accordingly, LEA may use document unlocking and optical character recognition (OCR) capabilities to provide accessible, tagged text documents for use by people with visual impairments, and also provide searchable documents. The unlocking and OCR processes are not faultless, and hence LEA cannot guarantee document perfection. However, taking these caveats into account, document accessibility is greatly increased. LEA also posts the original document where necessary, as obtained by LEA, such that users may compare any potential imperfections in the unlocked and OCR documents.